Explicație pas cu pas:
B.
1)
90cm+90cm+60cm+60cm
180+120=300cm
2)
2×90cm+2×60cm
180cm+120cm=300cm
3)
90cm+60cm+90cm+60cm
150cm+150cm=300cm
4)
2×(90cm+60cm)
2×90cm+2×60cm
180cm+120cm=300cm
C.
60cm+60cm+60cm+60cm=240cm
4×60=240cm
3.P-perimetrul
lungimea=55cm si lățimea=25cm
P=2×L+2×l
P=2×55cm+2×25cm
P=110cm+50cm
P=160cm
160cm×3=480cm
4.
l-lungimea
d-diagonala
d=2m}știm ca diagonala este jumatate din latură
l÷2=2
l=2×2
l=4